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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30785daeab78c8a41d4abf7c0c49283f5951cea997f1d76f9c2de3fa99eb306c' 
  AND token = 'Dyy9hNjduR7SZcMLdBZE4ZDqcHwGQHQ+mkUXWOsr5DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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