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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2705c38e639338704e3876cc9bdaa7f6ea0136a5ee8633c40865d477a9858c41' 
  AND token = 'li/LhXbt1lfEMpc/IPnCIG//Wsjpgt4r+8mXNZ06QBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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