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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d9746cf325d6151a377e1c099fa1d558cf708b79512d21dce01f922010f6d2' 
  AND token = 'vwhIjv4ZDrZ4VRudx3NlQwv2wI49Pw/dQ4No/2luxso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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