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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed592ce0bd2ea2dc7d3ae06733b4099bd251982e1405004e2c75dd73b5939e04' 
  AND token = 'TdcF5bda9J4koNAERt3RPJxkMWqxh62lc52sS6tj2H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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