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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8760d925373c75bbff05a712a40ba47750b8677005b725d003c80bc01b877741' 
  AND token = 'gLJDbMQvWGQKXNtfo0tLK54EvPOQ8wHReHa3jWcGys8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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