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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243ddf7a2fa4c6d0c415ecb994832ea26ec4563abd67ff9987f7de0fa5927a96' 
  AND token = 'rATwxbh9sqbQA1Pwh7lBtz7CFBHsjnZCaoFi1LK1r4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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