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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e3a66b3f234e41c5839a9f0f497982ed174bbaed9996b4797794bc73890ae6' 
  AND token = 'feJgx0i+vkP9HoHQZUINBfHqiI/+5tCcZEA32DMDUOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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