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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd764bd00a0104d4006fbc50d0c0ba9c4300ce09a81c91573f701b82f0c6461e5' 
  AND token = 'zmgSXu46axrTOXKtti/qd915k+/5rdFOT9/Up1b67q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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