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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a379b88929778b177a04748b1dcbb26a410607feb85f113b185d334e3095a03' 
  AND token = 'Pnw6yxVhqV4emUh3mkY6azueNzvKa3D9FJiiSm5Q4Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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