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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47bf6edc80c4f7466d80f17ad7b199ea072051826f6a2c60fb89532889f8f7b1' 
  AND token = 'Gj04cgPg/jBKtddr+f87obF9+DzW3EH3k56wMbyK7EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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