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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26a9357794c71056d1ea42043d67ef23bf681b15a3a190091a1d129c8716f28' 
  AND token = 'CSmJv5WxrKtdjJBMDBvZzl8ffOiMvdefmNu3OlmQlN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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