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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369cace52b25fb511b680a112ea5cb581ca455b4ef5a1c73b97a56b74e68d7a8' 
  AND token = 'GPCkkOF1DF4O+WewVQY4O/f57Xv6KIlXluU6NBrOCxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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