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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b724d93ff33e3a822cee037c570b972916bd2a30c95574b9f26afd1d93f5d86' 
  AND token = 'cVI0GnvmHNfhIemIDFGWurnxoW98VirhMdU5mvzwQXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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