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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa77c5a38f418f4854d0c185de440a6c485db78312057b13b098205197d1d8cd' 
  AND token = 'OOR7Hnj5d1WS90z6dXcEBCak6lSMbg940ONF9qCzi8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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