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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcc8a84f0b2fe47b4994a1f57aae92ee6265cadc1975fe930eda04e780549de' 
  AND token = 'rmRb7N71fRzHkFPstv7R77kxYAB8fddtCtE81y8NBqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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