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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f73d3b59251e85a75ff3504298a7fcdc6e0ebaec6513565dbec84e28dcbfd9' 
  AND token = 'nBrwRqbNxGZ4SbC3G0N+Mr6mYHa2a3+ITmhhyL0ucEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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