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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c6e6145e5cdcfab9499cfe4cf338929f7caa4af31798a2735a77049b46602c' 
  AND token = 'LFO1yBk587shTRkRlrLa3P8F4+ii++J9jsXGalNsm18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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