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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5947e9e9ee4b39092a25fd550822c486da07f36cbde84c6cf9c7aa87d9002a3' 
  AND token = 'KFBZ5iVc3Hec4b2C3GW47EMggNa2QOq4CFaEsaqoA4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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