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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f1dd8b0f646c4f1401d9d83ca19348f9e404db68f5330dd4d6351d570d3509' 
  AND token = 'h3hCDJSjcKWKZD9rkU1jcsZHasWj9zuO8l69ofqJM/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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