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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3704f7c4f0f7be3ab5cbd6c07f31173b1b7a46da0ce304e951a511f813cb0b7' 
  AND token = 'ct1tH8h1om+sM7ehbOSK38Zl7kByMpHHnc+z76+ByR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}