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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198711993df66dfb05afd2f87008cdd24b87820f5f7e21c90c9c18ed95ad498b' 
  AND token = 'HyOq/J7g/w/TPGudAuJCii1LWkOByDrTcABIlVjUOjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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