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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e1db1bbf68d47d2a1b5a4a77ef10cfd23e80dff613a9ae3603568868ac4eca' 
  AND token = '0gWkl6jsNb2MrHb2NcImKEx/wtFzSuC8KUTpDzEK/Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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