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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7038ad12f116161628bd9339b3fb288a9c57191ee9f8d21c9870dce5e98c1c58' 
  AND token = 'l8ye8RbVbRQA5iGt6k/QB2feOkW3cz7M6ddzR3UJ0Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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