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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793ddc7d623430032198eb22aede831f16b9a91b6e282d7d2439933175a757e2' 
  AND token = 'q24jg0xMRAxkGQulbrbW9tSuXodD++NV9FSQMoY1yx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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