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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c1388d692db7021ec2caaa801a37173e8946c05326e71173eaee7359342c41' 
  AND token = 'K1bgK0e0OtPa0M0UZ5XTD5J1qv2uiM1x2iiHFvd/nFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00180

JSON explain

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