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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0cdc81f8c60d7d53dcefdb9c0729b0e68d9df0a9417c6e02e57ff70d62f6de' 
  AND token = 'dow8ow9btXF8EwBDHln/QkC35aHuft6hsT9MwsJ/FLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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