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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89364585dada6f2b25734ee465630c54801225a8aba37b8c0de4c01c959a3ed0' 
  AND token = '6j2txnbudIGmwlzenQJTV9Hq8jjJ3CT6zoUKVL3t33k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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