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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e7b056af27142eefe93528d8df7021f4196f96b1b7ea8d097f152f9990b614' 
  AND token = 'UK9slxUKMSCQnSXpwWC+C6hEJsYVhNaf81AiF6GIm+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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