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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e3f0b727592c7d07bfd37471b6c242b0413e8238edd6685d175a55eddfd968' 
  AND token = 'Fz0tOxLQoNW/UMfxZVUOtEgp4K34PrKRFJ+xoI7OZgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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