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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cc418885227a0a8b5420809d003312a3fbc6c615ffac445fa32a7bf56cbf55' 
  AND token = 'WVT6+xAiNiWUt7skYQCZNRMmeLanJkoRvf51pI41/Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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