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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c343f408534c5d7e85a23db84a6a49cafd47702c9609b56f651c1efe344a0f6a' 
  AND token = 'wUFDiC8FJsSe/iQfSsb576e6BmU/mmc6Xfh0WLAJZk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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