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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3e3f76c8f5b4bec0a4b16d48fdd8a478383400e24ba53c2760c458e1cec5d3' 
  AND token = 'L9DAbNRZRsn0SHmNn5w+X/fnmB6WvRxF/TBmDutLMVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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