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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dddded1d6475329f9076dbfc0778dbd00e57e2f5dacecf4f5219f64ca1c4c22' 
  AND token = '0+7eZl80HIFvbnjITo+M5TbIT6bKj1doDGXWRWF+Jbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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