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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ee8558ebed8b9b3a5a4416bea1a541bd474f5aa42c57a541316e801882242c' 
  AND token = 'xsbs47Zk5KzZFZBhShNt7yZMSgmTWEH0Eme1yEI5tmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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