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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dee77da39a20fc6a174898eb0e5e521ed2ecaae016687572ba248906ce6ac5f' 
  AND token = '2BdZkcPc7TFdGpkxMEhDUUtOlQP1ueTJi7YuxpdMNog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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