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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94899385b1d2d5eed1da5f4c69abafeb6b12cf662fcb98d93687c18f965501dd' 
  AND token = 'av8wLd/r+QDlerRzGK0cNbjoenZzxIu+gcHb47c9pgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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