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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1b93eb1a936967e40d5d6b292ff607cb08fe62a577248307462b98b3d6dc06' 
  AND token = 'hUApUNQFhMGdPrw1rfWspJzNkBat6KqFNJWn2WShlcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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