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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfb0be0fddc7b6055e59b9e62c8d956e1d112b94ba935afc63496781ec8a9db' 
  AND token = 'pLttyfzxiWmQOfNw2ZMkHabrY010cyHNj7dzSU0Tbo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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