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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7ec4d905b63f3084ef54d8d6af54b67bdd7ef2831621bfd3d848b40f7ba4f7' 
  AND token = 'o6DaGX5NRLhfhic9K3tCAYPnChoBoWAsL8fd+luVQig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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