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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97500003408f35f520277f3f7ed7ff80ded64fd9fb9240617ce36f45f100531b' 
  AND token = 'jjV7F+nizv5wNMXQCH0M7J3Q32Fh86QPdemfbojug+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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