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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c02a24c02cb23970f07017a88e334cd8b2c541361315c5b6f2358894503398' 
  AND token = '9Y0D4ITZIYChy3NrR2PrpCUebsUdF0Tel3a0rrzvYKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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