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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e214a8c5e08a981073242a22cfc46832b4972d68aaf43fea31f4e51431112518' 
  AND token = 't/HfU7sCmMZLdJLM/3iUsQkYQmZXIZo4Dug0DK8iXiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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