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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6af240125c48571d7938343beac7bdf1bfdf4439d9a4b30a72c4d407ce6c9d' 
  AND token = 'CbexvvRZOjFTCDXiskKfmadtxZh62mFvOToi75Z0jfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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