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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c9921a72f4979021eded327b7bb28d4b6e51d412f8f692ac804461fcbe0af1' 
  AND token = 'iseFggPjXuO9tF+/BgrYaZG+rHTSjb9ySiU3Suhc6tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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