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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd094b327b7cb34f3f4a31ac4101e23128d1dddd68a1bccecae45c91f0ade8966' 
  AND token = 'O/yu+2/SuCKiik+jOcfHA0YaCu8d/YPfAjugg3uP0Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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