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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0021ddd127069888e63d7d28bd2233104c72b67bb279cbaecda45882071d7cbc' 
  AND token = '3xrj2IuGeEGY7vSntAipzsPhFhiucHHixbCLKEeMlGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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