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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd733be601a9b8e668951970823790da19da8362b9b7f04d0673b7cce82624d' 
  AND token = 'nCbfLPi0t/5pSY3AZmidkNP7adGrut0fbxlu3nP9+lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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