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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26979cf0b94763fe31fbdab67fdcae49f7c312aeb9ebfb0e75973f5c68efdfbf' 
  AND token = 'ApT+cuN9zHwoK2Js2P11mb7sA5rxU7+R2Q231XgBASw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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