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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79822cbed4de85c36e349cb239bc71bf4bbf66ce4cd9d2dfa9dbf8e88e816356' 
  AND token = 'YN7LoZ0M36Frig5/DktUtrxR4I6zmQa9VhneCvi/wc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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