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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3f4d7c75ef1708818c523206bd9dda8dd47f1a1ad26800266466bce7955523' 
  AND token = 'Jpt7oY5K9UmfEqWbtUTubFNL5dJ3c/Wsw8yGwA+RyIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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