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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f629f548d9d9152c692a719d64bd09f04a9e937ecb183c835e178546eb73cf19' 
  AND token = 'tK1QCfQ1BEkHgdqefi97nCxt1Co/AWW/FFvHL8gKIyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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