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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b28922113e3b4da3f722b4671e8f454ac7002f2d19df86f79530d018757790e' 
  AND token = 'zhPscozLBmLYBxakXBjvvQX7AsIptZ2NWQ4z97ZHBN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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