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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305abf32ff57eabca7227302a18a56a895fc63c091868966883dd43fd8218dc7' 
  AND token = '42N70s9rZEz9a63TzVlGI/Ex8Yyj2fqcsgsVK9DxcY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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