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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1070e6c270827bb73da750fcbdf96c35bb2cc704f594f80c8b9ff93d1f2b2cd' 
  AND token = 'ELenzDOFBUsG7bj0NsklyZgizHVKTkNgA5GVxklKUlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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