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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9900897b6698b021e4f3327c95cbc40610c0e9c041dec8e9edcaff132bf35ff5' 
  AND token = 'UDZMiI5B4eTqoJNcTIpZujomn54O3y/fUHr0GQQrp+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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