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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a16e23dc6181bc6b8488ffd6c436ce547a0171ed76d9bb52096fc79d157e60' 
  AND token = '6nt8Xtrzwv0P1o8pPCLS2rYWX/tqVJJnqN1ruTVpZTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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