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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95313e5c401cfbd5dd7e28ffe8be7fbddbaf41d402086de3691ae7f5dc2fe036' 
  AND token = '2Id6MWHSzaaKGe6iJnft4M2NIIyG+LTt6WA7MwIaJUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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