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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c017a6a6546f8a8157a8e6ae396f3d96dbc626abb6b4a563c428d746880c5e39' 
  AND token = '08ZWhu/E7XMtAtiveSbVyIEvch65CjvAz3z6dUeBTMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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