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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb29b185646c18b443efc08992dfe424996c9b1f370694ef5f96756f6325549' 
  AND token = 'fn8LMI5VbhYVjwWVDEfU4UYsNt99fgjdPckClo9KxbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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