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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06ffbdf4b5fc848cdbbbc4201c8247fd11dbf1d298bcc8c3e8061e84b1825c1' 
  AND token = 'VdTi40HOWOkPIJbNmYreFio5f0AqL/p3PH04gvSUPL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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