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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f96c86bc6606b63b4ae2bf882e071d4a0a8729d598ac20fc59fef781f67d9d2' 
  AND token = '/epDd6XnKCbpyBqNiorXrpX+cjYBxrN8CLdalkfeEo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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