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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565f7e0187e66427c601e944660b023d770916943dda055b16002ed70dc3ecf1' 
  AND token = 'hY22j9ds0Z19bX+W61irCMS95/B2727HMQWFH7/hgX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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