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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edbdd343b0a4fb767aa9b4dc7618ba9966c882aab9cb7167e4c48af5cffac63' 
  AND token = '91RKupLvauXhzNs5mpR2Hhz8qBT/GMuxW7LwamyFTP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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