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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9008c912a356e09d84a1f0f6259c20be80b616ebe9f577cd255a1357bc58ff04' 
  AND token = 'r+tI7tSQPT8GS/uv6BIyRWW8oFHT32aViaVu8ZuX43k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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