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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c780c6a58fd3590f558ca285b1ae887a68df5434ff9df45a7a7c5a53f2a0ee' 
  AND token = 'oSrXvkk0Il0Nr1E/wDzyArDez/iXkv7O3lL9PW02Ni4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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