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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2090ee394ac9af29d7d1261c6f7bfe91239ec19f7ee51fefadac4b2b4bdfca' 
  AND token = 'hOxoLuRb8Z6U6Rlh1wZhBSfTwynxFDpOQY9feyypjIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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