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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61dec4788e08f0ccb53bebad00297026540a513f79fad9a2965c7e9cdc62cf9' 
  AND token = '7pEZkMGtRPDskYi5ig8bIbYn4malkt+olLhQhGLVcLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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