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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463267e301715b5a6b7394f1f7a7675d2f5539f49fcf6c9c10fae0bdf4401143' 
  AND token = 'Su3sRYtleLjxC1o6UlQv4o59E6iUeCpfeNnvHN3UIGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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