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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd905ae3f8fd3ef9e37c450eb40303398d52d2c4a1d7c2ed90e1da3b70905df69' 
  AND token = 'TFiMvDkoAkMbpPQ9+VHWgl1DLD0g20avNsKkD4GjwT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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