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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cac8ce5e9ad52ccd83eb218ea976908520bd2586cdf07d60c61f806fbde1bf7' 
  AND token = '1yHeWu+T8rTo0S6H+zXYgKtDNV4FxixKipQ8tiwn8tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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