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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aee9fcda36141e87f8311d2addbbf30d62041af40b5db113b42c5c61e421c13' 
  AND token = '/yIdUcw1OY8S/BUEpwhXaVIyZvYPyP1rPyAUBED815g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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