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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa450ba5a60fff320e8d248cc10669ca51bc17d2f6610435a5370977c1ded33' 
  AND token = '0jcyfs3T6z7pLTm3hUI0ikffKQl9npGTk9EeSzwX99M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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