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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c7401b37e46515d774eee8ab38e90c0fec80acd13ddc2924c85332e7a90df2' 
  AND token = 'q+IkXiRSlv+QOgqrgcyi71zTfzsElt8g/2zs2GJhFYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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